The two curves implemented in WPF have their 0 points on the Y-axis not parallel to the X-axis

“I’m currently using WPF to create two curves, but why aren’t the 0 points of the two Y-axes parallel to the X-axis? Here’s my code:”

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XAxisRange = new DoubleRange(0, datas[0].UNewData.Max());
LeftYAxisRange = new DoubleRange(-880, 300);
RightYAxisRange = new DoubleRange(-880, 300);
C# code

((XyDataSeries<double, double>)DataSeriesIV).Append(datas[0].UNewData, datas[0].INewData);
if (datas[0].PNewData != null)
{
((XyDataSeries<double, double>)DataSeriesPV).Append(datas[0].UNewData, datas[0].PNewData);
}